convert polyfill package to TypeScript

[Zyie]

Description of change

Converts the polyfill package to TypeScript

I wasn't sure the best way to handle window.Uint32Array so i just used as any. I'm happy to update it if you guys want it changed

Other than that it was a simple enough conversion

Pre-Merge Checklist

• Lint process passed (npm run lint)
• Tests passed (npm run test)

[codecov-commenter]

Codecov Report

Merging #6654 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #6654   +/-   ##
=======================================
  Coverage   82.59%   82.59%           
=======================================
  Files          35       35           
  Lines        1724     1724           
=======================================
  Hits         1424     1424           
  Misses        300      300           

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[bigtimebuddy]

Looks good! I'm okay with casting as any in these cases.